The physical effects of Lipetsk meteoroid. 2
| 1Chernogor, LF 1V.N. Karazin Kharkiv National University, Kharkiv, Ukraine |
| Kinemat. fiz. nebesnyh tel (Online) 2019, 35(5):25-47 |
| https://doi.org/10.15407/kfnt2019.05.025 |
| Start Page: Dynamics and Physics of Solar System Bodies |
| Language: Russian |
Abstract: Comprehensive modeling studies of the processes induced in all geospheres by the passage and explosion of the meteoroid near the Lipetsk City (Russia) on June 21, 2018 are described. Thermodynamic and plasma effects, as well as the effects of the plume and turbulence, accompanying the passage of the Lipetsk meteoroid are estimated. It is shown that the passage of the celestial body led to the formation of a gas-dust plume. The heated trail of the meteoroid cooled for several hours. Four stages of meteoroid trail cooling are considered in detail. The first of these persisted for ~0.01 s, and the temperature of the trail decreased by a factor of two due to emissions. During the second stage of order of 1 s in duration, cooling due to the trail emissions and expansion took place, and the temperature of the trail decreased by 15 %. In the course of the third stage of order of 3 s in duration, the products of the explosion and the heated gas, thermic, experienced an 100...200 m/s2 acceleration and attained an 200 m/s speed of uplifting, and the temperature decreased on 10 percents. The fourth stage persisted for 100 s, during which the thermic absorbed the cool air at an intensive rate and gradually cooled off and decelerated. The maximum altitude of the uplifting of the thermic reached 15...20 km. Contained in the thermic, the products of the explosion, specks of dust and aerosols, further took part in the following three processes: a slow precipitation to the surface of the Earth, turbulent mixing with the ambient air, and the transport by the predominant winds around the globe. The effect of turbulence in the trail has been shown to be well-pronounced, while the effect of magnetic turbulence has been shown to be weakly displayed. The following basic parameters of the plasma in the trail have been estimated: the height dependences of the electron densities per unit length and per unit volume, their relaxation times, the particle collision frequencies, the plasma conductivities, and the electron temperature relaxation time. At the initial moment, the linear and volume electron densities in the trail have been shown to be equal to about (2...40)·1023 m–1 and (1...4)·1021 m–3<.sup>, respectively, and the plasma conductivity to be equal to ~ 1000 Om–1m–1. The role of the dusty plasma component is discussed. |
| Keywords: complex simulation, Lipetsk meteoroid, plasma, plu¬me, thermodynamic effects, turbulence effects |
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